<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*通配符选择器，一般用于页面标签样式的初始化*/
        * {
            color: green;
        }        
    </style>
</head>
<body>
    <h1>标题</h1>
    <p>段落</p>
    <span>span盒子</span>
    <div>div盒子</div>
</body>
</html>